# Grotto Spring, Grand Cañon, Colorado River, No. 4 from the series "Explorations and Surveys West of the 100th Meridian"

- By: Timothy O'Sullivan (American, born Ireland, 1840–1882)
- Date: 1871
- Medium: Albumen print, stereo
- Classification: Photograph
- Dimensions: Each image: 9.3 × 7.5 cm (3 11/16 × 3 in.); Card: 10 × 17.8 cm (3 15/16 × 7 1/16 in.)
- Culture: United States
- Credit line: Purchased with funds provided by Richard L. Menschel
- Museum: [Art Institute of Chicago](https://www.artic.edu/artworks/103154)
- Rights: [Public domain (CC0)](https://creativecommons.org/publicdomain/zero/1.0/)
- Picture: https://www.artic.edu/iiif/2/aae1bc4c-02fc-2d6d-01c9-4c986bae889e/full/!1920,1080/0/default.jpg
- Who can see it: Kids profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

Text printed on reverse of stereocard:

WAR DEPARTMENT, CORPS OF ENGINEERS, U. S. A.<BR> Geographical EXPLORATIONS and SURVEYS WEST of the 100th MERIDIAN. No. 4.

Grotto Spring, Grand Cañon, Colorado River. The water flows from the rocks above, and the umbrella-shaped rock about it is tufa, that has been formed by deposition from the mineral constituents of the water. The light spot seen through and beyond is the sand-beach of the river. Looking through this Grotta is seen in the distance the walls of the Grand Cañon, 3.500 feet in height on either side.

Description © Art Institute of Chicago, CC BY 4.0